Data transmission method having improved network address translation method in home gateway and a system thereof

Abstract

A data transmission method and a data transmission system using an improved network address translation method. The data transmission method includes requesting a real-time service from a multimedia device to a home gateway within a home network; inputting a binary code corresponding to the multimedia device to a service type field indicating priority information of data when the home gateway forms a mapping table used for conversion of addresses; the home gateway requesting setting of an IP address of the multimedia device from a service provider; setting the IP address including the binary code corresponding to the multimedia device according to the request of setting the IP address; and the service provider transmitting a data packet including the binary code corresponding to the multimedia device. The method is applied to the selective IP packet, thereby shortening the transmission time of real-time data packets for multimedia.

1 . A data transmission method comprising: 
 requesting, by a multimedia device, a real-time service from a home gateway within a home network;    inputting a binary code corresponding to the multimedia device to a service type field indicating priority information of data, when the home gateway forms a mapping table used for conversion of addresses;    requesting, by the home gateway; setting of an Internet Protocol (IP) address of the multimedia device from a service provider;    setting the IP address including the binary code corresponding to the multimedia device according to the request of setting the IP address; and    transmitting, from the service provider, a data packet including the binary code corresponding to the multimedia device.    
     
     
         2 . The method according to  claim 1 , further comprising: 
 converting, at the home gateway, the IP address of the multimedia device by using the binary code; and    transmitting the data packet to the multimedia device.    
     
     
         3 . The method according to  claim 1 , wherein the binary code is a two-bit code.  
     
     
         4 . The method according to  claim 1 , wherein inputting the binary code, corresponding to the multimedia device to the service type field, comprises inputting 01, 10, and 11 sequentially according to a request order of the multimedia device from the home gateway.  
     
     
         5 . The method according to  claim 4 , wherein when the multimedia device requests the real-time service from the home gateway after 01, 10, and 11 are input, the home gateway rejects the request of the multimedia device.  
     
     
         6 . The method according to  claim 4 , wherein when the multimedia device requests the real-time service from the home gateway after 01, 10, and 11 are input, the home gateway deletes the mapping table related to the multimedia device corresponding to the first assigned binary code and assigns the first assigned binary code to the service type field of the mapping table related to the multimedia device.  
     
     
         7 . The method according to  claim 1 , wherein, in forming the mapping table used for the conversion of the address, a private IP address and a port number are extracted from the multimedia device and the extracted private IP address and the extracted port number are assigned into the mapping table.  
     
     
         8 . The method according to  claim 2 , wherein, in converting the IP address of the multimedia device by using the binary code, the mapping table is searched and the IP address of the multimedia device is converted.  
     
     
         9 . The method according to  claim 1 , wherein, in inputting the binary code, corresponding to the multimedia device to the service type field, comprises inputting the binary code into unused bits of the service type field.  
     
     
         10 . A data transmission system comprising: 
 a home gateway which converts protocols by connecting a plurality of communication networks to each other;    a multimedia device on the home network; and    a service provider which transmits data to the home gateway,    wherein the multimedia device requests a real-time service from the home gateway and receives a data packet for the real-time service,    when forming a mapping table used for conversion of an address, the home gateway inputs a binary code corresponding to the multimedia device to a service type field indicating priority information of the data, and requests the service provider to set of the Internet Protocol (IP) address of the multimedia device, and    the service provider sets the IP address including the binary code corresponding to the multimedia device according to the request to set the IP address, and transmits the data packet including the binary code corresponding to the multimedia device.    
     
     
         11 . The system according to  claim 10 , wherein the home gateway converts the IP address of the multimedia device by using the binary code.  
     
     
         12 . The system according to  claim 10 , wherein the home gateway transmits the data packet to the multimedia device.  
     
     
         13 . The system according to  claim 10 , wherein the binary code is two bits.  
     
     
         14 . The system according to  claim 10 , wherein the home gateway inputs sequentially 01, 10, and 11 according to a request order of the multimedia device from the home gateway.  
     
     
         15 . The system according to  claim 14 , wherein when the multimedia device requests the real-time service from the home gateway after inputting 01, 10, and 11, the home gateway rejects the request of the multimedia device.  
     
     
         16 . The system according to  claim 14 , wherein, when the multimedia device requests the real-time service from the home gate way after inputting 01, 10, and 11, the home gateway deletes the mapping table related to the multimedia device corresponding to the first assigned binary code and inputs the first assigned binary code to the service type field of the mapping table related to the multimedia device.  
     
     
         17 . The system according to  claim 10 , wherein when the home gateway forms the mapping table used for the conversion of the address, the home gateway extracts a private IP address and a port number from the multimedia device and inputs the extracted private IP address and the extracted port number into the mapping table.  
     
     
         18 . The system according to  claim 11 , wherein the home gateway searches the mapping table and converts the IP address of the multimedia device.  
     
     
         19 . The system according to  claim 10 , wherein the home gateway inputs the binary code corresponding to the multimedia device to the unused bits of the service type field, when assigning the binary code corresponding to the multimedia device to the service type field.